/*
 * IzPack - Copyright 2001-2012 Julien Ponge, All Rights Reserved.
 *
 * http://izpack.org/
 * http://izpack.codehaus.org/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.izforge.izpack.api.rules;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public abstract class ConditionWithMultipleOperands extends Condition
{
    private static final long serialVersionUID = -947580950752190486L;

    protected List<Condition> nestedConditions = new ArrayList<Condition>();

    public List<Condition> getOperands()
    {
        return nestedConditions;
    }

    public void addOperands(Condition... operands)
    {
        Collections.addAll(nestedConditions, operands);
    }

    @Override
    public Set<String> getVarRefs() {
        HashSet<String> vars = new HashSet<String>();
        for (Condition condition : nestedConditions) {
            vars.addAll(condition.getVarRefs());
        }
        return vars;
    }
}
